Tried it. Here is the output: C:\WinSetupFromUSB\files\grub4dos>grubinst -v --pause (hd3,0) Start sector: 0x3F Image type: NTFS Install mode grubinst: Write error Press <ENTER> to continue ... Note the write error . . .. Also, see the attached screenshot, indicating that the boot sector was not properly updated So, I tried a different thumb drive for kicks and got the following result: C:\WinSetupFromUSB\files\grub4dos>grubinst -v --pause (hd3,0) Start sector: 0x3F Image type: FAT32 Install mode The MBR/BS has been successfully installed Press <ENTER> to continue ... Note that this one worked, but that it was formatted FAT32, not NTFS. I tried re-formatting it to NTFS and had the same failure as the first USB drive. I then re-formatted the first drive to FAT32 and tried re-installing Grub. This time it worked. C:\WinSetupFromUSB\files\grub4dos>grubinst -v --pause (hd2,0) Start sector: 0x3F Image type: FAT32 Install mode The MBR/BS has been successfully installed Press <ENTER> to continue ... So, it looks like the problem I'm having is related to NTFS. I should note that I am running Vista with UAC turned on. The commands were run from an elevated command prompt window and I ran WinSetupFromUSB as an administrator. Do you have any additional suggestions? Thanks in advance! --Russel